Question

    Which of the following weeds has a cup-shaped corolla?

    A Avena ludoviciana Correct Answer Incorrect Answer
    B Convolvulus arvensis Correct Answer Incorrect Answer
    C Chenopodium album Correct Answer Incorrect Answer
    D Cyprus rotundus Correct Answer Incorrect Answer

    Solution

    Convolvulus arvensis or Field bind weed flowers have a funnel shaped corolla with 5 lobes that are united with very shallow joining lines between the lobes that look more like wrinkles in the white corolla.  

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